ATLANTA, GA — Porsche AG is a company renowned for its technological might. But the company has yet to consider adopting new mechanical clutch-pack AWD technology. At the U.S. introduction here of Porsche's new 911 Carrera 4 — Porsche's classic sports car fitted with AWD — Porsche engineers say they're intrigued by new AWD designs like those employed by the Volkswagen Group, but continue to favor the viscous-coupling center differential used in the previous-generation Carrera 4, for some ...

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